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The Allen-Bradley 1747-L20E SLC 500 Fixed Controller integrates a processor, power supply, and 20 I/O points within a compact framework, making it ideal for streamlined automation needs. Operating on a power supply of 120-240V AC, it features an 8kHz high-speed counter, 12 current sinking inputs, and 8 transistor-based outputs. Communication is facilitated via a receive-only DH-485 port, complemented by LED status indicators. Offering a 1K program memory backed by a 5-year lithium battery RAM, it ensures data retention, with optional UVPROM or EEPROM backup available. With noise immunity as per NEMA Standard ICS 2-230, and certifications from UL and CSA, this controller operates reliably across a temperature range of 0-60°C. It supports a scan rate of 8ms per 1K instructions, while its durability is enhanced by a rugged design capable of enduring varied environmental conditions.